The bars on the top and bottom you're trying to get rid of?
You can use crop for the height. But it doesn't get rid of them entirely. Best you'll get is top filled but bottom has thin black bar.

@theboy181
Stretch should probably fill the top and bottom of the screen.

It would be better if the Stretch option had another option to keep aspect ratio or not. So the entire screen could be filled.

And then maybe if the 'keep aspect ratio was checked, have a zoom option. To allow you to zoom the display until the black bars disappear. Which is basically what the display was like on an old CRT TV. Old TV's you could never see the L/R edges of the true display, it was zoomed in a bit.